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    <title>RGraph: Javascript charts library - Zooming your charts</title>
    
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        <a href="../index.html">RGraph: Javascript charts library</a>
        >
        <a href="index.html">Documentation</a>
        >
        Zooming your charts
    </div>

    <h1>RGraph: <span>Javascript charts library</span> - Zooming your charts</h1>

    <script>
        if (RGraph.isIE8()) {
            document.write('<div style="background-color: #fee; border: 2px dashed red; padding: 5px"><b>Important</b><br /><br /> Internet Explorer 8 does not natively support the HTML5 canvas tag, so if you want to see the charts, you can either:<ul><li>Install <a href="http://code.google.com/chrome/chromeframe/">Google Chrome Frame</a></li><li>Use ExCanvas. This is provided in the RGraph Archive.</li><li>Use another browser entirely. Your choices are Firefox 3.5+, Chrome 2+, Safari 4+ or Opera 10.5+. </li></ul> <b>Note:</b> Internet Explorer 9 fully supports the canvas tag.</div>');
        }
    </script>


    <ul>
        <li><a href="#canvas">Canvas mode</a></li>
        <li><a href="#thumbnail">Thumbnail mode</a></li>
        <li><a href="#area">Area mode</a></li>
    </ul>


    <a name="canvas"></a>
    <h2>Canvas mode</h2>

    <table border="0" width="100%">
        <tr>
            <td>
                <p>
                    As of November 2009 RGraph has had the ability to provide a zoom facility. It's designed to be used in
                    conjunction with a context menu as in the example to the right.
                </p>

                <p>
                    You can control the zoom using these properties:
                </p>
                
                <ul>
                    <li>chart.zoom.mode<i>Default: canvas</i></li>
                    <li>chart.zoom.factor<i>Default: 1.5</i></li>
                    <li>chart.zoom.fade.in <i>Default: true</i></li>
                    <li>chart.zoom.fade.out <i>Default: true</i></li>
                    <li>chart.zoom.hdir <i>Default: right</i></li>
                    <li>chart.zoom.vdir <i>Default: down</i></li>
                    <li>chart.zoom.delay <i>Default: 50</i></li>
                    <li>chart.zoom.frames <i>Default: 10</i></li>
                    <li>chart.zoom.shadow <i>Default: true</i></li>
                    <li>chart.zoom.mode <i>Default: canvas</i></li>
                    <li>chart.zoom.thumbnail.width <i>Default: 75</i></li>
                    <li>chart.zoom.thumbnail.height <i>Default: 75</i></li>
                    <li>chart.zoom.background <i>Default: true</i></li>
                </ul>
            </td>

            <td style="text-align: center">
                <canvas width="600" height="250" id="myc">[No canvas support]</canvas>
            </td>
        </tr>
        
        <tr>
            <td colspan="2">
                The possible values of <i>chart.zoom.hdir</i> are: <i>left</i>, <i>center</i>, <i>right</i>.
                The possible values of <i>chart.zoom.vdir</i> are: <i>up</i>, <i>center</i>, <i>down</i>. <i>chart.zoom.delay</i>
                is the delay in between frames (in milliseconds) and <i>chart.zoom.frames</i> is the number of frames in the zoom. <i>chart.zoom.shadow</i>
                is whether the zoomed canvas has a shadow or not. The possible values of <i>chart.zoom.mode</i> are <i>canvas</i> (default)
                and <i>thumbnail</i>.
            </td>
        </tr>
    </table>

    <script>
        window.onload = function ()
        {
            var graph = new RGraph.Bar('myc', [[4,6],[6, 8],[8,6],[7,5],[9,4],[4,7],[3,5],[8,6],[7,6],[4,7],[5,4],[5,6],[6,4]]);
            graph.Set('chart.colors', ['#f66', '#66f']);
            graph.Set('chart.strokecolor', 'rgba(0,0,0,0)');
            graph.Set('chart.labels', ['Fry','Hav','Jim','Moo','Io','Olga','Tim','Gaz','Jake','Pippa','Lou','Fred','John']);
            
            if (!RGraph.isIE8()) {
                graph.Set('chart.contextmenu', [
                                                ['Clear annotations', function () {RGraph.Clear(graph.canvas); graph.Draw();}],
                                                ['Zoom in', RGraph.Zoom]
                                               ]);
                graph.Set('chart.annotatable', true);
                graph.Set('chart.zoom.hdir', 'left');
                graph.Set('chart.zoom.factor', 1.5);
                graph.Set('chart.zoom.vdir', 'center');
                graph.Set('chart.zoom.frames', 50); // Number of frames
                graph.Set('chart.zoom.delay', 5);  // Delay between each frame
                graph.Set('chart.zoom.shadow', 'rgba(0,0,0,0.7)');  // Show a shadow on the zoomed chart
                graph.Set('chart.zoom.background', true);
            }

            graph.Set('chart.title', 'Chart with zoom (context, annotatable)');
            graph.Set('chart.shadow', true);
            graph.Set('chart.shadow.color', '#999');
            graph.Draw();

            var myLine = new RGraph.Line('myc2', [40,48,45,64,34,22,23,56,56,54,84,44], [4,5,6,7,20,21,1,9,9,8,5,4]);
            myLine.Set('chart.labels', ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec']);
            myLine.Set('chart.hmargin', 10);
            myLine.Set('chart.linewidth', 3);
            myLine.Set('chart.title', 'A sample line chart');
            myLine.Set('chart.colors', ['red', 'black']);
            myLine.Set('chart.shadow', true);
            
            if (!RGraph.isIE8()) {
                myLine.Set('chart.contextmenu', [['Zoom entire chart', RGraph.Zoom]]);
                myLine.Set('chart.zoom.delay', 15);
                myLine.Set('chart.zoom.factor', 1.5);
                myLine.Set('chart.zoom.mode', 'thumbnail');
                myLine.Set('chart.zoom.vdir', 'center');
                myLine.Set('chart.zoom.thumbnail.width', 100);
                myLine.Set('chart.zoom.thumbnail.height', 100);
            }
            myLine.Draw();
            
            myLine2 = new RGraph.Line('myc3', [15,30,62,26,46,86,48,51,51,35,32, 35]);
            myLine2.Set('chart.background.grid.width', 0.5);
            myLine2.Set('chart.shadow.offsetx', 1);
            myLine2.Set('chart.shadow.offsety', 1);
            myLine2.Set('chart.shadow.blur', 2);
            myLine2.Set('chart.shadow', true);
            myLine2.Set('chart.zoom.mode', 'area');
            myLine2.Set('chart.hmargin', 10);
            myLine2.Set('chart.linewidth', 2);
            myLine2.Set('chart.title', 'A chart with zoom in area mode');
            myLine2.Set('chart.tickmarks', 'endcircle');
            myLine2.Set('chart.labels', ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec']);
            myLine2.Draw();
        }
    </script>

    <br clear="all" />

    <pre class="code">
&lt;script&gt;
    var graph = new RGraph.Line('myc', [4,6,8,7,9,4,3,8,7,4,5,5,5]);
    graph.Set('chart.labels', ['Fry','Hav','Jim','Moo','Io','Olga','Tim','Gaz','Jake','Pippa','Lou','Fred','John']);
    graph.Set('chart.contextmenu', [
                                    ['Clear annotations', function () {RGraph.Clear(graph.canvas); graph.Draw();}],
                                    ['Zoom in', RGraph.Zoom]
                                   ]);
    graph.Set('chart.title', 'Chart with zoom (context, annotatable)');
    graph.Set('chart.shadow', true);
    graph.Set('chart.annotatable', true);
    graph.Draw();
&lt;/script&gt;
</pre>


    <a name="thumbnail"></a>
    <h2>Thumbnail mode</h2>
    
    <canvas id="myc2" width="600" height="250" style="float: left">[No canvas support]</canvas>

    <p>
        The zoom has an alternative thumbnail mode, which displays a small thumbnail zoom instead of zooming the entire canvas.
        The chart to the left shows an example of this.
    </p>

    <p>
        It uses some of the same properties as the regular zoom, eg <i>chart.fade.in</i>, <i>chart.fade.out</i>, <i>chart.zoom.shadow</i>
    </p>

    <br clear="all" />

    <pre class="code">
&lt;script&gt;
    var myLine = new RGraph.Line('myc2', [40,48,45,64,34,22,23,56,56,54,84,44], [4,5,6,7,20,21,1,9,9,8,5,4]);
    myLine.Set('chart.labels', ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec']);
    myLine.Set('chart.hmargin', 10);
    myLine.Set('chart.linewidth', 3);
    myLine.Set('chart.title', 'A sample line chart');
    myLine.Set('chart.zoom.mode', 'thumbnail');
    myLine.Set('chart.zoom.vdir', 'center');
    myLine.Set('chart.zoom.thumbnail.width', 100);
    myLine.Set('chart.zoom.thumbnail.height', 100);
    myLine.Set('chart.colors', ['red', 'black']);
    myLine.Set('chart.shadow', true);
    myLine.Set('chart.contextmenu', [['Zoom entire chart', RGraph.Zoom]]);
&lt;/script&gt;
</pre>

    <p>
        <b>Making the zoom circular</b><br /><br />
        <img src="../images/border-radius.png" width="171" height="159" alt="A circular zoom window" style="float: right; border: 1px gray solid" />
        It is possible to make the zoom in area mode circular by utilising the <i>border-radius</i> CSS property. Currently support for
        this is limited to FireFox 4b7+ and MSIE9, so it's not part of the main RGraph software. The CSS ncessary to achieve this is
        thus:
    </p>
    
    <pre class="code" style="width: 700px" />
&lt;style&gt;
    .RGraph_zoom_window {
        border-radius: 50px ! important;
    }
&lt;/style&gt;
</pre>
    
    This a chart demonstrating this technique <a href="zoom_thumbnail.html">here</a>. Note that browser support for this technique is limited.
    
    <br clear="all" />


    <a name="area"></a>
    <h2>Area mode</h2>
    
    <canvas id="myc3" width="600" height="250" style="float: right">[No canvas support]</canvas>    
    
    <p>
        Another type of zoom available is <i>area</i>. This is somewhat similar to thumbnail, but allows you to draw a rectangle around
        the specific area that you want to zoom.
    </p>
    
    <p>
        Again, this uses some common zoom properties, such as <i>chart.zoom.factor</i>.
    </p>
    
    <p>
        Once visible, you can drag the zoomed area around with the left mouse button (a left drag), and drag the zoomed canvas around
        within the zoom by using the right mouse button (a right-drag). And a double click will expand the zoomed area to cover the
        whole canvas.
    </p>

    <br clear="all" />

    <pre class="code">
&lt;script&gt;
    var myLine = new RGraph.Line('myc3', [15,30,62,26,46,86,48,51,51,35,32, 35]);
    myLine.Set('chart.zoom.mode', 'area');
    myLine.Set('chart.hmargin', 10);
    myLine.Set('chart.linewidth', 1);
    myLine.Set('chart.title', 'A chart with zoom in area mode');
    myLine.Set('chart.tickmarks', 'endcircle');
    myLine.Set('chart.labels', ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec']);
    myLine.Draw();
&lt;script&gt;
</pre>

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